General
Girls Wait Longer: Why Autism in Girls Is Diagnosed Years After Boys
28.09.2026 · AUTIFACE
For decades, autism was considered a "boys' issue." New research shows the picture is far more complex: girls on the spectrum exist - they're simply diagnosed later, and sometimes far too late.
A large study published this year in the journal JAMA Network Open examined medical records of 171,134 patients in a large U.S. healthcare system between 2016 and 2024. The standout finding: girls and women received an autism diagnosis an average of 3.4 years later than boys and men, at an average age of 15.7 compared to 12.3. Even among children alone, girls were diagnosed an average of one and a half years later. The researchers also found that after 2020, there was a sharp rise in diagnoses among girls, while the numbers for boys remained stable or declined.
A Swedish study published earlier this year in the journal BMJ added a surprising perspective. Researchers analyzed data from more than 2.7 million people born in Sweden between 1985 and 2022, and found that by age 20, the likelihood of an autism diagnosis is nearly identical for boys and girls. The difference is mainly in timing: boys are identified in childhood, while girls "catch up" during adolescence.
Why does this happen? One reason is that diagnostic tools were built largely based on research conducted on boys. Another reason is "masking": many girls learn to imitate their peers, rehearse conversations in advance, and memorize social "scripts." On the outside, they appear to be managing fine - but on the inside, they pay a price in exhaustion and overwhelm. Their areas of interest can also seem "age-appropriate" at times, and so don't trigger any red flags.
The real cost of late diagnosis: girls miss out on the early intervention years, when therapies in communication, occupational therapy, and social skills can make the greatest difference. Instead, many of them struggle alone until adolescence, when social demands become more complex and the difficulties are harder to hide.
A large study published this year in the journal JAMA Network Open examined medical records of 171,134 patients in a large U.S. healthcare system between 2016 and 2024. The standout finding: girls and women received an autism diagnosis an average of 3.4 years later than boys and men, at an average age of 15.7 compared to 12.3. Even among children alone, girls were diagnosed an average of one and a half years later. The researchers also found that after 2020, there was a sharp rise in diagnoses among girls, while the numbers for boys remained stable or declined.
A Swedish study published earlier this year in the journal BMJ added a surprising perspective. Researchers analyzed data from more than 2.7 million people born in Sweden between 1985 and 2022, and found that by age 20, the likelihood of an autism diagnosis is nearly identical for boys and girls. The difference is mainly in timing: boys are identified in childhood, while girls "catch up" during adolescence.
Why does this happen? One reason is that diagnostic tools were built largely based on research conducted on boys. Another reason is "masking": many girls learn to imitate their peers, rehearse conversations in advance, and memorize social "scripts." On the outside, they appear to be managing fine - but on the inside, they pay a price in exhaustion and overwhelm. Their areas of interest can also seem "age-appropriate" at times, and so don't trigger any red flags.
The real cost of late diagnosis: girls miss out on the early intervention years, when therapies in communication, occupational therapy, and social skills can make the greatest difference. Instead, many of them struggle alone until adolescence, when social demands become more complex and the difficulties are harder to hide.
What this means for you
A girl who "holds it together" at daycare or school and falls apart when she gets home is a sign worth paying attention to. Meltdowns, crying, or the need for complete silence after a day at school are not always "just tiredness."
Pay attention to unusually deep areas of interest, difficulty with transitions, sensitivity to sounds, fabrics, or smells, and one particular friend the child clings to.
Going in for an assessment? Tell the professionals explicitly about the gap between behavior at home and behavior outside. A girl who seems relaxed during a structured one-hour appointment may still struggle significantly in everyday life.
Already have a child on the spectrum in the family? It's worth taking a close look at the sisters too, with open eyes.
And if you are mothers who recognize yourselves in this article - you are not alone. More and more women are being diagnosed in adulthood, and for many of them, the diagnosis finally brings explanation and relief.
Pay attention to unusually deep areas of interest, difficulty with transitions, sensitivity to sounds, fabrics, or smells, and one particular friend the child clings to.
Going in for an assessment? Tell the professionals explicitly about the gap between behavior at home and behavior outside. A girl who seems relaxed during a structured one-hour appointment may still struggle significantly in everyday life.
Already have a child on the spectrum in the family? It's worth taking a close look at the sisters too, with open eyes.
And if you are mothers who recognize yourselves in this article - you are not alone. More and more women are being diagnosed in adulthood, and for many of them, the diagnosis finally brings explanation and relief.
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